What made europeans in the americas realize that they needed a new workforce in the early 1500s? they realized that american indians lacked training and physical skill. they realized that american indians were dying from disease and overwork. they realized that the natural resources in the americas were running out. they realized that the encomienda system they had set up was wrong.

becasue in the south they disallowed slavery but in the north slavery was illegial this boilled into because mexico wanted slavery

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.